4G67 Head

[TurboLaserRS]

I have a few questions about this swap. First off will the 4g67 head hold up to boost? And will the stock ECU be able to account for this? I can't tune right now since my car is as stock as stock gets and this head is a much more affordable option than getting my stock head rebuilt.
The only mods coming this summer will be an exhaust, manual boost controller, a boost gauge, walbro 255, and an adjustable FPR.

I have searched google as well as tuners and I really can't find any definitive answers except for threads about N/T cars which doesn't really help me much.

Any advice would be appreciated.

 

[92AWDHX40]

You should have a wideband, and some sort of way to tune your engine, hold up to boost? Whatever engine you use get it ready for boost, if it isnt already. 4g67? whats in your car now? Get something to tune with?

 

[96' Eclipse GS]

I have been reading a little, ha that's what I call it. Being that the head is a High comp. and big port head, and it is DOHC from the Sirius family, it is not going to be a problem fitting/lining up from 1.8L, but maybe you will need to see if the higher deck height MAY effect the timing belt length will need to configure something on those lines. On boost it SHOULD hold under STOCK boost levels, but nothing OVER stupid... sorry about the long sentence....someone can input if i have gotten anything you think is wrong.

 

[TurboLaserRS]

I didn't want to make a rehash of a previous thread but. I bought the car with bent valves. The local shop wants 400 dollars to fix my busted head. Its a 1g Laser RS Turbo. I found a 4G67 head in the classifieds that will bolt up and bump the compression slightly. I have nothing to tune with, as theres no point in tuning it. It is completely bone stock. The car that this head came off of was not turbo, and the only info I can find pertaining to the 4G67 head on a 1g 4G63 is of course on non turbo motors. That being said, with future supporting mods in place I am going to eventually run higher than stock boost. I don't want to think I'm getting a good deal now, and later down the road have to get yet another head for some unforeseen reason.
-But first, the car actually needs to run.

 

[96' Eclipse GS]

If I were you, I would just eat the bullet and rebuild me a new head or find a used one in decent condition and start from there....good luck

 

[bastarddsm]

4g67 head is basically the same as a 4g63 head. It has smaller chambers. 42cc vs 47cc for the 4g63. The valves are shrouded a little more. I calculated it once and it made a 9:1 4 g63 motor 9.5:1. I ran one for a while, didn't seem to make a difference.

I'd guess you'd need to pull a degree or more of timing out to keep it happy. Been a while since I ran it.

 

[TurboLaserRS]

Thanks guys, I guess I'll either keep waiting for a head to pop up on the classifieds, or I can use my friends rebuilt 7 bolt head that has about 300 miles on the rebuild. He said he would give it to me for free. I just don't know if anything else has to be done to the head to use it besides enlarging the bolt holes or not. He said something about a cam position sensor difference.

 

[19Eclipse90]

Enlarge the bolt holes in the 7-bolt head, reuse the cam sensor that came in your car. Done.

 

[TurboLaserRS]

Thanks, that was a quick response. I've never even driven this car before so I guess if it loses a little bit of power because of the smaller 2g ports I'll never know the difference anyway.

 

[19Eclipse90]

Ah, you didn't specify it was a 2G 7-bolt head. No matter. Overall, it remains as straightforward as that. You'll obviously use a 1G intake manifold gasket as well, but I'm sure that goes without saying.

I don't know how drastic the performance losses will be, but if you don't know any better, I suppose it can't be that bad.

 

[ThunderChild]

wait...wouldnt he need a 2g intake manifold to go with that head? if he uses his 1g IM, hell have ports twice the size of the 2g head ports...make for some pretty nasty turbulence in the intake.

 

[bastarddsm]

wait...wouldnt he need a 2g intake manifold to go with that head? if he uses his 1g IM, hell have ports twice the size of the 2g head ports...make for some pretty nasty turbulence in the intake.

Maybe. It also might not even matter.

 

[ed1380]

No. The hyundai head has large 1g ports

 

[ThunderChild]

No. The hyundai head has large 1g ports

sorry i was referring to him using the 2g head mentioned by 19eclipse90. maybe im confused?

 

[dsmusmc]

No. The hyundai head has large 1g ports

The head I pulled off a Sonata had very similar ports to the 2G. The 4G67 and 4G61 are the same casting as the 4G63 head with slight differences including the compression bump. You will be fine. Kind of like a 4G63 block and a 4G64 or G4CS block. 4G67=1G ports, 4G61=2G ports. IMO if you have a 2G head use it but don't be an idiot and port match it to a 1G manifold and ruin the velocity of that head. Lose in power? HA!!! You will gain some low/mid range along with torque. The debate of 1G vs 2G will always be there. The way I look at it the EVO runners are almost identical to the 2G head.